我用IO完全模式作了一个程序主线程循环用AcceptEx接受连接，如下
while(1)
{
SOCKET Acceptsock=WSASocket
                (AF_INET,SOCK_STREAM,0,NULL,0,WSA_FLAG_OVERLAPPED);

DWORD bytes;
LPPER_IO_OPERATION_DATA  overlapped;//一个以OVERLAPPED开头的结构

         overlapped=(LPPER_IO_OPERATION_DATA)GlobalAlloc(GPTR,
sizeof(PER_IO_OPERATION_DATA));
overlapped->oplvtype = ZHU_ACCEPT;
overlapped->sock = Acceptsock;

char buff[sizeof(SOCKADDR_IN)*2+16];
if(AcceptEx(Listensock,Acceptsock,buff,0,
sizeof(SOCKADDR_IN)+16,
sizeof(SOCKADDR_IN)+16,
&bytes,&(overlapped->overlap))==0)
{
if(GetLastError()!=WSA_IO_PENDING)
{
AfxMessageBox("Accept Error:%d",aa);
return;
}
}
}
但是因为采用异步方式接受连接，故次段程序不停运行，不断的开辟LPPER_IO_OPERATION_DATA  结构空间，但只有有连接时创建的结构有效，别的要将内存回收，请问我如何在这段程序中知道那一次调用的AcceptEx是真正接受到连接的？